Compensating piston-pin



To `all whom t may concern It (l li (l UNITED STATES PATENT OFFICE.

`'.'rzeroiifrAs B. man, OF HURON, SOUTH DAKOTA, AssTGNoR or ONE-HALF To MAX f ROYHT., or nunon, SOUTHDAKOTA.

` COIIPENBATING PISTON-PIN.

Be it known that I, THOMAS B. Tann, a citizen of the United` States, residing at Huron, in the county of Beadle, State of South Dakota, have invented certain new and useful improvements in Compensating Piston-Pins; and I do hereby declare the following tO be a full, clear, and exact description of theuinvention, such as will enable others Skilled in the art to which it appertains to malle and use the same.` l y This invention-relates pto new and useful improvements in engine or like pistons, and particularly to thepins which connect the lipiston rods to theiplstons."

Olie `object ofithepresent invention is to `produce a `noveland improveddevice of this character wherein adjustment of the piston, to compensate for the wear thereofyandethe wear of the hushing inwhich it rotates. E

`Another Objectis topi-Ovide a `novel and improved device of this character which can be easily and quickly manipulated without removing the` piston from the cylinder.

V.'inother object is to provide a novel and imiiroved adjusting means i'or the wrist pin of a piston which includes meansfor loeking the Vsume against accidental ment. i.

Otherobjects andadvantages will be apparent from the following description `when taken in connection with the accompanying drawing.

ln the drawing:

Figure l is a vertical longitudinal sectional View through a iston showing the wrist pin and piston ro in elevation.

F ig. 2 is a vertical longitudinal sectional `View taken centrally throufrh the piston, a `portion of the cylinder and the piston rod and wrist pin, on the line 2-2 of Fig. 1.

Fig. 3 is a vertical transverse sectional view taken centrally through the wrist pin and piston, on the line3-3 of Fig. 2.

Fig. l is a vertical sectional view through one end of the wrist pin and the tapered plug therein, on the line 4-4 of F1 1, showing the pin carried by the bus ing which engages inthe groove of the plug to prevent rotation thereof. i n

Fig. 5 is a perspective view of the iston pin removed from the piston and without the operating screw :for the threaded stem of the tapered plugs.

` Specification of LettersPatent.

Application med March 18, 1920.

provlsion is made furthev displace- PatentedJan. 18, 1921. Serial No.` 367,013.

l VReferring particularly to the accompany'- ing drawing, represents a piston having the wrist pin bearings 10 in which are dis posed the bushing sleeves 11, a space or opening 12 being arranged between the beai`- ings for the reception and play of the tubular head 13 of the piston rod 14. Disposed longitudinally through the bushings 11 is the wrist pin 15, which Valso is disposed through the tubular head 13 of the piston rod 14. The head 13 is split longitudinally at its pointof juncture with the piston rod. as shown at 16, whilethc zuljentportionI ofthe piston rod is longitudinally split, et 17, in continuation of the split of the head. Disposed through the threaded into the same, split, is a clamping screw 18 i'or drawing the head into firm frictional emln'acing engage ment with the wrist pin. Held by the screw 18. is one end of a leaf spring 1), the Outer or free end of which is disposed adjacent the tubular head 13, and is formed with a forked portion 20. One leg of the fork is at one side of the bent outwardly to form a pawl Q1. to which reference piston rod, and` worm wheel 23 securedto its intermediate i portion. The periphery of the worm wheel 23 rotates in an elongated slot 24 formed in the outer face of the wrist pin. The wrist pin is split longitudinally, as shown at 25, said split extending transversely through the center of the slot 24. Formed transversely through the piston rod, at the point of juncture with the head 13, is an opening 26 through which is disposed a worm sha-iii; Q7 which meshes with the worm wheel 23. The worm shaft 27 is formed with a head 28 in which is 'formed a slot for the reception of a screw driver, and by which means the shaft is adapted to be turned to rotate the stem .22. The inner face of the head 28 is formed i ith a series of teeth 29` with which the `pawl leg 21 of the leaf spring 19 engages to prevent retrograde rotation oi? be made to fit more snugly within the bushing il. ln the outer face of each plug there lis Jformed a longitudinal groove 3l in which a central angular recess 33 for the reception ofthe angular end-ofY a suitable tool for turning the plug, when the piston has been completely removed from the cylinder. This Vis used when the device is applied to engines already in'use, in which case the Ascrew 27 is omitted. ldlhen, however, the device is built in new engines, the piston not being removed from the cylinder, the screw driveris passed through openings 34- and 35 formed in the cylinder wall and in the skirt oi the piston,` respectively, and engaged with the slot of the head ofthe worm shaft 22. A plug 3G is provided for the opening 34C of the cylinder wall to prevent out y'ard splashing of oil from the crank case. It will be noted that theopening 3d ofthe piston wall is necessarily formed at a point below the lower end of the water jacket of the cylinder.

By reason or' the inward taper of each oi" the plugs, and the fact'tha-t the wrist pin is split throughout its length, when the worm'wheel-?) is rotated, the threaded portions of the stem 22 will cause the plugs to be moved inwardly or outwardly or the wrist pin, with the result that the wrist pinv is expanded or contracted to permit the same to lit properly vwithin the bushing, and thus take up the wear and prevent the knocking thereof.

lVhat is claimed is:

l. A piston wrist pin including an exp andible body, a turnbuckle in the body and having a pinion thereon, expanding meinbers carried by the turnbuckle, and a pinion for rotating the turnbuckle.

2. The combination with a cylinder and piston having openings adapted for registry at times, of a piston wrist pin including a longitudinally split hollow body, an oppositely threaded stem in the body, a worm wheel on the stem, a piston rod embracing the pin, and a worm shaft carried by the piston rod and engaging with the worm wheel, access to said worm shaft being had through said piston and cylinder openings.

3. A piston wrist pin including a split hollow body, expanding plugs in the ends ot the body, an oppositely threaded stem in the body and engaged in the plugs, said stem having a key receiving socket in each end, a piston rod having a tubular head emb ne ing the pin and having an opening therethrough, the intermediate portion of the hollow body having an opening immediately inward of the opening of the rod, a worm wheel on the center of' the stem and rotatable in the opening of the hollow body, a worm shaft in the opening oi the rod and meshing with the worm wheel., and means carried by the rod and engaging with the worm sha-ft for holding the latter against acridental rotation.

ln testimony whereof I aflix my signature, in the presence of two witnesses.

THOMAS B. TEEL.

Witnesses lV. C. PETERSON, T. H. NULL. 

